They have to be introduced and pushed on both sides , maybe you hear a "click", maybe not, and you may help with a hand if you get the back of the headunit(hu) pushing to you.maybe i can help more if you sendme a closer picture. sometimes you have to take off the plastic molder that are over the edge of the hu
Disconnect the negative battery cable from the Dodge battery. The negative cable connects the battery to the frame of the vehicle. Use a Phillips-head screwdriver to loosen the cable'c clamp. Remove the clamp from the negative battery lead post.
Remove the dash trim panel that surrounds the stereo and climate control knobs, using a trim panel removal tool. Start at the bottom of the trim and work the tool around the perimeter until the panel is completely removed.
Remove the screws on either side of the Dodge stereo mounting bracket with a Phillips-head screwdriver.
Pull the stereo unit from the dash mounting bracket. Pull the stereo far enough to reach the wiring connections at the rear of the deck.
Disconnect the wire groups from the back of the factory stereo. There are four groups, for the antenna, power supply, speakers, and amplifier. Grab the groups by the plastic wire binders, not the wires themselves.
Reconnect the negative battery cable to operate the vehicle or any electrical components. Place the negative cable clamp around the negative lead. Use a Phillips-head screwdriver to tighten the clamp until the clamp cannot be moved around the lead by hand.
Usually answered in minutes!